Dba 4000 Rotors

[Paolo Sancho]

hey sorry to flog an old dead horse, but I have the exact same issue as cro on the standard bf xr6 turbo setup. I get squeels when driving normally at slower speeds, generally when my foot is on neither brake or accelerator. The squeel is only intermittent though. It will only occur for a split second then disappear, but I can recreate the exact same noise when rolling into a corner and when I turn right into a street, I get a squeel from the back left, and when I turn left I get a squeel from the back right. not to mention squeels when braking at lights 24/7. I am currently looking at upgrading thanks to the tax man. I very rarely get up the ute and have never been to a track day and only give it some if I think someone is worth having a run against. also I got stock rotors/calipers but running bendix $100 repco pads. I know that's my problem right there, but I have had the car for 1 1/2 yrs and never had these problems till I recently changed the brake pads 2 months ago, with the exact same pads that were already in there.

[Bellato]

Does it squeal when you break lightly as well mate? Sometimes with new pads you'll find a lot of light braking cakes brake dust onto the discs and when you break lightly you get that squeal from the pads only just grabbing the discs. Go up and down the road and do some really hard brakes, that'll clean up the discs then go for a drive and see if the squeal is still there.

That way you can try eliminate cheap stuff before spending money on new discs when you may not need them.

[discostig]

I've got a question, I'm chasing a set of front DBA4000 T3 rotors for the BFII (322mm).

I ordered some from a local shop going by part number DBA42107S. When I collected them they are boxed as the 4x4 survival series seen here http://www.dba.com.au/products/4x4-survival-series/

The DBA site above does indicate they are motorsport suitable.

Is there a difference? I checked the box and the sticker does indeed say DBA 42107S (batch 42107S27091261K2)

I got them for about the same price that GSL Rallysport and Race Brakes Sydney list them at (after delivery) but am concerned that maybe not having "club spec" means different metallurgy.

I'd ask the shops but I'm sure they will be shut by now!

Edited 14/03/13 12:13 PM by -SteveR-

[aiboart]

Pretty sure that, 'Clubs Spec' is simply marketing shorthand.

Go to the DBA website and it will confirm that the 4000 slotted series (now in the form of T3) are intended for club level trackwork.

[discostig]

Yeah it does say motor sport suitable on the link I gave above to the DBA site. Should be the same rotors, if part numbers match...you'd think!

[bossmang]

does anyone know if the DBA

5000 T3 2 piece rotors are a direct fit like the 4000's?

[aiboart]

Yep, there are.

[bossmang]

cool

that comes to my next question

whats the advantage of the 2 piece?

[discostig]

Keep heat away from hub and allow cheaper replacement (disc only instead of mount to hub).

Also looks HEAPS SICK

I am talking out my arse though there might be another reason, or I could be wrong entirely

Edited 15/03/13 11:45 AM by -SteveR-

[aiboart]

What does it do?

Frees up the iron disc to expand in the radial direction with high temps. A solid rotor tends to bend out of the plane I.e. coning.

As per above post, reduces heat transfer to hub and bearings.

Nice side effect.

Drops a bit of unsprung rotational mass out of your steering wheels.

Looks cool but really only to the owner... The black hats have a very subtle appearance when fitted and can only be seen from close up and from certain directions. When covered in brake dust they are exceedinly stealthy, I think that is a good thing. As for the gold-hats, you just wouldn't.

Allows a bit more airflow into and around the hub and into the centre of the rotor.

Why would you bother?

There are generally two approaches to getting more out of a (braking) system, making it bigger and making it better.

In a vehicle the former approach adds more mass, more inertia and more rotational inertia, all of which is counterproductive in the grand scheme of things.

The latter approach, if available, just adds more cost.

Other

Some two piece discs are designed to float out of the plane. Not sure if the DBA5000's can do this as the discs are mounted to the hats using nuts and screws.